Abstract

We report a large-core, Yb-doped photonic crystal fiber amplifier generating diffraction-limited (M2=1.04),∼0.45 ns,∼8 GHz linewidth pulses with energies of 540 µJ, peak power in excess of 1.1 MW, and average power of ∼7.2 W at a repetition rate of 13.4 kHz. The pulse peak spectral brightness exceeds 10 kW/(sr Hz cm2) and is the highest generated by a fiber source, to our knowledge.

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